cameroon gce O level June 2023 physics 2

cameroon gce O level June 2023 physics 2

cameroon gce O level June 2023 physics 2

Section 2
Answer all questions choosing, EITHER the a, b and c OR the d, e, and f of each question. Answer EITHER 7 a, b and c
7. (a) (i) State Newton’s second law of motion. (2 marks)
(ii) Describe an experiment to show the relationship between force (F) and acceleration (a). Your description should include:
a list of apparatus needed
a diagram of the set-up
the procedure you will use to collect data
how the data will be used to show the relationship between force and acceleration
any precaution taken to minimize error.
(7 marks)
(b) An object weighing 500 N on earth is taken from the earth’s surface to another planet whose acceleration due to gravity is 6.5 m s-2.
(i) Give one difference between mass and weight. (1 mark)
(ii) Calculate the weight of the object on this planet. (3 marks)
(c) A uniform metre bar of length 100 cm and mass 20 kg is pivoted at its 30 cm mark. A load, X, is placed at the end of the bar closer to the pivot to balance the weight of the bar.
(i) Define the moment of a force, (1 mark)
(ii) State two conditions necessary for an object to be in equilibrium. (2 marks)
(iii)Draw a diagram showing all the forces acting on the bar and their respective distances from the pivot.
(2 marks)
( iv) Calculate the weight of the load, X. (2 marks)
OR 7(1, e, and f
7. (d) (i) Define specific heat capacity. (2 marks)
(ii) Describe an experiment to determine the specific heat capacity of an aluminium block. Your description should include:
a list of apparatus needed
a diagram of the set-up
the procedure you will use to collect data
how the data will be used to obtain the specific heat capacity
any precaution taken to minimize error. (7 marks)
(e) A mass of 5 kg of water is heated with a 500 W heater for 20 minutes.
(i) Calculate the heat supplied by the heater supplied during this time. (2 marks)
(ii) Given that the specific heat capacity of water is 4200 J kg-IK-1, determine the change in temperature of the
water during this time. (2 marks)
(iii) Explain why water is often used as a cooling liquid in car radiators. (2 marks)
(f) A student used an un-calibrated thermometer in the laboratory to measure the temperature of a given liquid. 1 le first put it in pure melting ice and the mercury thread was 10 cm long. He then removed it and put in steam froin boiling water, the mercury thread was 50 cm long. Then he puts it in the liquid and the mercury thread was
35 cm long.
(i) Define temperature. (1 mark)
(ii) State two properties that make mercury suitable for use in thermometers. (2 marks)
(iii)Calculate the temperature of the liquid. (2 marks)